Balancing device for centrifugal and similar pumps, blowers, and the like.



i e l W. SGHEURMAN-N.'

BALANCING DEVICE FOR GENTRIEUGAL AND SIMILAR PUMPS, BLOWERS, ANDTHE LIKE.

' APPLIUATIONHLED 00T. 15, 190s. 933,345, Patented Sept. 7, 1909.

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/ z, 3 m h IA lff V 4 and Similar Pumps, fully described andl UNITED 4SiAlYES PATENT GEEK),

WALTER scHEUnMANN, or NEWARKLoN-TRENT, ENGLAND, Assrcnon To HENRY n.

WORTHINGTON, A CORPORATION 0F' NEW ERSEY.

BALANCIN G DElICE FOR CENTRIFUGALAND SI'MILAR PUMPS, BLOWERS, AN'D TH LIKE.

Specication of Letters Patent.

To all Iwhom it may concern:

Be it known that I, WALTER SOHEURMANN, a citizen of the Republic of Switzerland, residing at Newark-on-lrent, England, have invented certain new and useful Improvements in Balancing Devicesfor Centrifugal Blowers, andthe Like, represented in the following specification and theaccompanying drawings,`forming a part of the same.

The especial object of the present invention is to providel simplea'nd eiiicient means forbalancing theiaxial thrust in centrifugal pumps, but the invention is applicable also to other rotating pumps and blowers, and-to motors, such as water turbines, steam and etc., vand similar machinery inv whichiV the balancing of-axialthrust is regas turbines,

Iii accordance with my invention, Iemploy a pressure diskV orpistonmoving with the shaft axially, in combination with `fixed abutment-s forming pressure chambers on opposite sides'of the disk through which pressure chambers fluid is circulated, eachof these chambers being` supplied with fluid from a suitable sourcethe chambers being of small axialwidth throughout or .in places soy that the velocity of flow and the pressure will be varied as the disk moves with the shaft to increase or decrease the axial Width,

of the circulating Achamber 4between the disk and abutment, the pressure on the opposite side of the disk being-atthe same time -re' versely. varied, as thexjchainbr on one side increasesin axial width as the other decreases and vice versa. Al double balancing effect isthus secured by the movement of the disk, securing an eflicient balancing Witha small amountof fluid and small pressure surfaces and reducing the axial movement of` the shaft wit-hin smalllimits. Since each of the balancin chambers is supplied with fluid indepen ently of the flow Athrough-the other chamber, the control .of the pressure ofV the fluid on each side of the disk is dependent solely onv the axial widthvof its chamber, a-njd not on the varying width of the chamber on the opposite side-of the disk, so that vthe* desired balancing eil-'ect may be readilyand accurately secured by proper pro ortioning of the surfaces and positioning, 'o the dislc I A restricted outlet commento the cha,mbers on opposite sides of the ldisk is preferably used, but there may be separate outlets for the opposite sides of the disk.`

In the accompanying drawings forming a part of this specification, there 1s shown for pump of a Well known type embodying the Patented Sept. 7,1909.-

vthe purpose of illustration `a centrifugal'l 60 invention in a preferred form, and. certain modifications thereof, and this construction will now be described in detail and the fea-v turesformingthe invention-then specifically pointed out in the claims. i

In the ldrawings:.;-l`igl 1re l is a vertical central section cfa-centrifugal pump enibodying thel'inventionh Figs. 2 and 3 are de tails showing modifications..

In the drawingsfA is the pump casing, B the' suction C the discharge, D the` pump shaft, and E the impell'er. 'All these parts may be of any suitable construction and' are 'shown as of a common type.

Referring now to the features especially embodying the-invention,'l0 is the balancing disk orv piston which may or may'not be fxedto theshaft to rotate therewith but is arranged to move with the shaft On opposite ,sides of the dlsk 10 are abutments 1l, 12 forming narrow chambers or circulating spaces 1, 2 on opposite sides of.

the disk, these spa/ces, 1, 2 connecting inner chambers 8, 4, on opposite sides of the disk adjacent to the shaft, withl discharge chamber .5 surrounding the disk; Balancing fluid maybe taken fromv any suitable supply but is shown as supplied through openlng 6, from the side impeller chamber, the two.` chambers 3, et being shown as connected "by a .passage through the disk, andthe fluid is discharged from the `chamber 5 through axially.

a restricted discharge outlet 7. lVear plates lV 8 'are preferably used on the abutments, where the balancing pressure is especially applied.

The operation of this construction will be understood `from a brief description. balancing fluid from supply passage 6 passes rom the chambers 3, 4 through chambers l, -2 to, the discharge chamber 5 and outlet 7.

VIfthe shaft is in central lposition so that the passages 1, 2 are of equal width,the presvsure on opposite sides of the dish-'10` is the same. If theaxia'l thrust be such as to tend to move the-shaft D to the left, for instance,

the movement of the disk 10 to the leftwill narrow the passage 1 andincrease the-fluid The pressure on that side of the disk and simultaneously widen the passage 2 and decrease the pressure on this side of the disk, untily the axial thrust upon the shaft is' balanced -by thev dilference of lpressures on opposite y sides of the disk. On an axial thrust to the of the disk, thus forinstance,

right, the operation is reversed, the pressure on the right side ofthe disk l0 being increased and that onltheleft side decreased. Many modifications may be made n'this construction, and the arrangement of the a'butments and chambers, and of the supply and discharge passages, may be widely varied.

y In Fig. 2 there is shown a construction in which separate supply-.passages 6 for the chambers 3, t on opposite sides -of the balare shown as tapered on opposite sidesgand i the disk as similarly concaved, which will provide more extended balancing surfaces, 1f the common discharge outlet from an-an- A nular chamber surrounding t-he balancing disk bensed, as in Fig. l. A n

-In F 3 is illust-rated a feature which will be found desirable in sme cases in which a considerable axial thrust .in one direction is known to exist always.y In this construction the narrow passages through whichthe balancing fluid passes are of different diameters, so that the pressure upon one side of the disk is exerted at a greater distance from the shaft radially, thus insides vofthe disk creasing the leverage of the pressure on4 one side to balance theiixed or permanent thrust. A single supply passage or separate supplies for opposite sides of the disk may be used in this construction.

lVhat I claim is l. The combination with a rotating shaft, of apressure disk or piston moving axiall.

rwith the shaft, fixed abutments on opposite sides of the disk forming narrow spaces between the disk and abutments, and fluid supply and discharge passages for circulating balancing Huid through the spaces on opposite sides of the disk independently of each other'.

2. The combination with a rotating shaft,

of a pressure disk or piston moving axially with the shaft, fixed abutments ou opposite sides of the disk forming narrow spaces between the disk and abutments, means for supplying balancing fluid to the narrow spaces on oppositesides of the disk independently of each other, and a singlere- Vstricted discharge passage for the spaces.

3. The combination with a rotating shaft, of a. pressure disk or piston moving axially with the shaft, fixed abutments on opposite opposite sidesof the disk reduced through a portion of their dia-meter to form pressure surfaces of dilferentradii on opposite sides of the disk, and supply and discharge passages for circulating balancing Huid between said surfaces on opposite sides of the disk .independently of each other.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses. A

WALTER SCHEURMANN. .Vitnesses E. lV. HUs'rED, J. ANDERSON.

forming fluid chambers on i, 

